Compression tester for combustion engines



April 13,1?25.

1.580386 C.KRONE COMPRESSION TESTER FOR COMBUSTION ENGINES Filed NOV, 4,1925 atented Apr. 13, 1923.

CHARLES KRONE, OF DAVENPORT, IOWA.

COMPRESSION TESTER FOR COMBUSTION ENGINES.

Application filed November To all whom it may concern:

Be it known that 1', CHARLES KRONE, a citizen of the United States,residing at Davenport, in the county of Scott and State of Iowa. haveinvented a certain new and useful Compression Tester for CombustionEngines, of which the following is a specification.

The object of my invention is to provide a compression tester forcombustion engines of simple, durable and comparatively inexpensiveconstruction.

More particularly, my invention relates to a compression tester adaptedto be positioned upon an automobile engine block above the cylinderopening therein, and secured to the engine block wherein the compressionwithin the cylinder may be tested.

Still a further object is to provide adjustable means of connectionbetween the compression tester and the engine block adapting it for usein connection with various cylinders regardless of the position of thecylinder within the engine block.

With these and other objects in view, my invention consists in theconstruction, arrangement and combination of the various parts of mydevice, whereby the objects contemplated are attained, as hereinaftermore fully set forth, pointed out in my claims, and'illustrated in theaccompanying drawings, in which:

Figurel is a top, plan view of my improved compression tester, partsbeing broken away and shown in section to better illustrate theconstruction thereof.

Figure 2 is a side view, parts shown in section illustrating mycompression tester secured to an engine block over a cylinder opening.

Figure 3 is a detail, sectional view through the lower edge of thetester showing the gasket construction used therein; and

Figure 1 is a detail, sectional view of the inlet valve for the tester.

In the accompanying drawings, I have used the reference numeral toindicate an ordinary engine block provided with acylinder opening 11 anda piston 12 therein.

The engine block 10 is ordinarily pro vided with a number of screwthreaded openings 13, which are used to receive the 4, 1925. Serial No.66,736.

bolts which anchor the engine head to the engine block proper.

My improved compression tester comprises a casting or fitting 14 whichis formed with a cylinder opening 15 of substantially the same size asthe cylinder opening 11, and also substantially the same area as theopening ordinarily provided in the engine head.

The casing 14 above the cylinder 15 is formed with a spider member 16arranged with a cover 17 whereby there is formed substantiallytriangular. shaped notches 18. The notches 18 are each designed toreceive an elongated link 19. Each link19 is connected to the casting 11 by machine screws 20 which are free to rotate within openings 21formed in the cover 17.

The machine screws 20 extend into th links 19 as clearly shown in Figure2 of the drawings. Each link 19 is formed with an elongated slot 22which permits the bolts 23 used for fastening the tester to the engineblock to be slid toward or from the tester proper so that the bolts 23may be positioned to coact with the screw threaded openmgs 13 in theengine block.

The links .19 are free to swing between any two walls of the spidermember16, thus permitting greater adjustment.

One of the links 19 is'shown in dotted lines in an adjusted position inFigure 1 of the drawings.

The lower edge of the casting 14, which is designedto rest upon theengine block 10 is formed with a groove 24; which receives a bushing orpacking 25.

' 'lhecasting 14 is formed with a central opening 26 which is screwthreaded at its upper end for permitting a pressure gauge 27 to beconnected therewith.

An inlet valve fitting 28 is mounted in the side of the casting 1a andis in comunication with the cylinder opening 15 through the passage way29.

The valve fitting 28 includes a valve seat opening 30 adapted to receivea ball normally held in seated position by a spring 32. The tension onthe spring 32 may be varied by adjusting av sleeve within the fitting28.

The details of the inlet valve are clearly shown in Figure 4- of thedrawings.

lVashers 34: may be interposed between the head of the bolts 23 and thelinks 19 if necessary.

Practical operation.

The practical operation of my compression tester includes the removal ofthe engine head from the block 10 and positioning the casting or fittingl i over the cylinder opening 11. The links 19 may then be swung aroundto such position where the bolts 23 will register with the screwthreaded openings 18 ordinarily provided in the block 10.

hen the bolts 23 are tightened so that a positive connection is hadbetween the member 1a and the engine block 10, then the compressiontester is ready for operation.

lVhen the piston 12 is moved in a down direction the ball 31 in thevalve 28 will be unseated for permitting air to pass into the cylinder11.

When the piston 12 is moved in an upward direction, the ball 31 will beseated and the pressure or compression within the cylinder 11 will thencause the gauge 27 to register such compression.

By use of a compression tester of the kind shown in my drawings, I amable to test the compression of each cylinder and can readily find anyfaulty cylinder.

My compression tester saves to a great extent the labor sometimesnecessary to remove the engine head after it has once been replaced inposition after work has been done on the pistons 12.

lVith my device the test so far as corn pression is concerned may bemade without the necessity of putting the entire engine head upon theblock'and then testing the compression.

Some changes may be made in the construction and arrangement of thevarious parts of my invention, without departing from the real spiritand purpose of my invention, and it is my intention to cover by myclaims, any modified forms of structure or use of mechanicalequivalents, which may be reasonably included within their scope.

I claim as my invention:

1. In combination with an engine block having a cylinder openingtherein, of a compression tester comprising a member adapted to fit overthe cylinder opening in the engine block, means for connecting saidmember with the engine bloc-k, an inlet valve in said member incommunication with the cylinder opening and a gauge on said memberadapted to register the compression within said cylinder opening.

2. In combination with an engine block having a cylinder openingtherein, of a compression tester comprising a member adapted to fit overthe cylinder opening in the engine block, means for connecting saidmember with the engine block, said means comprising links extendingradially from said member having slots therein and bolts extendingthrough said slots for connection with the engine block, an inlet valvein said member in comn-runication with the cylinder opening and a gauge011 said member adapted to register the compression within said cylinderopening.

3. In combination with an engine block having a cylinder openingtherein, of a compression tester comprising a member adapted to fit overthe cylinder opening in the engine block, means for connecting saidmember with the engine block, same means comprising links extendingradially from said member having slots therein and bolts extendingthrough said slots for connection with the engine block, said linksbeing pivotally connected with said member, an inlet valve in saidmember in communication with the cylinder opening and a gauge on saidmember adapted to register the compression with said cylinder opening.

4:. In combination with an engine block having a cylinder openingtherein, of a con'ipression tester comprising a member adapted to fitover the cylinder opening in the engine block, said member having agroove formed in its lower edge, a gasket adapted to fit in said groove,means for connecting said member with the engine block, said meanscomprising link e:\tend ing adially from said member having slotstherein and bolts extending through said slots for connection with theengine block, said links being pivotally connected with said member, aninlet valve in said member in communication with the cylinder openingand a gauge on said member adapted to register the compression withinsaid cylinder opening.

5. A compression tester comprising a member having an opening therein ofsubstantially the same area as the opening in an engine head, saidmember being adapted to fit over a cylinder opening in an engine block,means for maintaining the position of said member relative to the engineblock, said means including a. plurality of links formed with elongatedslots, bolts extending through said slots and adapted to coact withscrew threaded openings formed in the engine block, an inlet valve insaid member in commun' ration with the opening formed therein and acompression gauge mounted between said member.

Des Moines, Iowa, October 22, 1925.

CHARLES KRON

